Dispersion slab geometry

Here, a flat slab geometry is assumed. Dx is the dispersion coefficient for hydrogen in the basket and K is the first-order kinetic constant. As shown in Fig. 7-32, we take -V — 0 at the center of the catalyst tube. A solution to Eq. (7-38) satisfying the boundary condition x = 0, dHL/dx = 0 is given as... 

If, however, the alumina particles are represented by the pseudohomoge-neous model, assuming slab geometry, neglecting the axial dispersion and the film mass transfer resistance (it has been demonstrated (ref. 2) that the effects of these two variables are negligible in comparison with the effect of the internal diffusion resistance), the theoretical transfer function for the study zone is given by ... 

Whenever the drug is dispersed in the polymer at low eoncentrations, drug release from a slab geometry may be described using the Higuchi model (a.85-a.87). Thus ... 

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